Concept

Wien approximation

Related publications (8)

Polarization dependence of single-photon sensitivity in superconducting nanowires at extended infrared wavelengths

Polarization dependent performance of superconducting nanowire single-photon detectors (SNSPDs) remains one of the obstacles to free space applications of SNSPDs. Here, we study the wavelength dependence of polarization anisotropy in two most widely used SNSPD geometries: meander and fractal nanowires based on niobium nitride thin films. In particular, we observe that polarization sensitivity becomes more pronounced at longer wavelengths, accompanied by an oscillatory behavior of photon count rate (PCR) on

AIP Publishing2026

Accuracy of momentum and gyrodensity transport in global gyrokinetic particle-in-cell simulations

Laurent Villard, Ben McMillan

Gyrokinetic Particle-In-Cell (PIC) simulations based on conservative Lagrangian formalisms admit transport equations for conserved quantities such as gyrodensity and toroidal momentum, and these can be derived for arbitrary wavelength, even though previous ...

Amer Inst Physics2014

Gyrokinetic transport relations for gyroscale turbulence

Laurent Villard, Alberto Bottino, Sébastien Jolliet, Ben McMillan, Thibaut Vernay

We derive explicit local transport relations for the global gyrokinetic formalism at arbitrary wavelength. This is an extension of the analysis in Scott et. al. 2010 where this was examined in the long-wavelength limit. Deriving a local expression for the ...

IOP Publishing2012

8 mW fundamental mode output of wafer-fused VCSELs emitting in the 1550-nm band

Elyahou Kapon, Vladimir Iakovlev, Alexei Sirbu

We report record-high fundamental mode output power of 8 mW at 0 °C and 1.5 mW at 100°C achieved with wafer-fused InAlGaAs-InP/AlGaAs-GaAs 1550 nm VCSELs incorporating a re-grown tunnel junction and un-doped AlGaAs/GaAs distributed Bragg reflectors. A broad wavelength tuning range of 15 nm by current variation and wavelength setting in a spectral range of 40 nm on the same VCSEL wafer are demonstrated as well. This performance positions wafer-fused VCSELs as prime candidates for many applications in low pow

2011

Simulations of global electrostatic microinstabilities in ASDEX Upgrade discharges

Olivier Sauter, Laurent Villard, Jan Vaclavik, Alberto Bottino

Electrostatic microinstabilities in ion internal barrier (ITB) and H-mode discharges of the ASDEX Upgrade tokamak [O. Gruber, R. Arslanbekov, C. Atanasiu , Nucl. Fusion 41, 1369 (2001)] have been investigated with a full radius gyrokinetic code. The code models linear stability and includes the effect of an equilibrium radial electric field and trapped electrons. In order to simulate plasmas in experimental conditions [k(perpendicular to)rho(L)similar toO(1)], the long wavelength approximation in the quasin

2004

Fast bolometric measurements on the TCV tokamak

Henri Weisen, Richard Pitts, Ivo Furno, Philippe Marmillod, Xavier Llobet

The design and first results are presented from a bolometric diagnostic with high temporal resolution recently installed on the TCV tokamak. The system consists of two pinhole cameras viewing the plasma from above and below at the same toroidal location. Each camera is equipped with an AXUV-16ELO linear array of 16 p-n junction photodiodes, characterized by a flat spectral sensitivity from ultraviolet to x-ray energies, a high temporal response (< 0.5 mu s), and insensitivity to low-energy neutral particles

1999

The Rayleigh law in piezoelectric ceramics

Dragan Damjanovic

The direct longitudinal piezoelectric effect (d(33)) in lead zirconate titanate, barium titanate, bismuth titanate and strontium bismuth titanate ceramics was investigated with respect to the dependence on the amplitude of an alternating pressure. At low alternating pressure amplitudes, the behaviour of the piezoelectric charge and the piezoelectric coefficient may be explained in terms of the Rayleigh law originally discovered for magnetization and magnetic permeability in ferromagnetic materials. The char

1996

The photolytic laser chemical vapor deposition rate of platinum, its dependence on wavelength, precursor vapor pressure, light intensity, and laser beam diameter

Hubert van den Bergh

The rate of photolytic laser chem. vapor deposition (LCVD) of Pt from its bishexafluoroacetylacetonate precursor is measured as a function of the light intensity, the wavelength, the precursor pressure, and the laser beam diam. at the surface. The wavelength dependence of the deposition rate indicates that the photodissocn. yield does not depend only on the absorption coeff. of the precursor, but may differ from one absorption band to another. This is indicative of the different photophys. processes assocd.

1990

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Related publications (8)

The photolytic laser chemical vapor deposition rate of platinum, its dependence on wavelength, precursor vapor pressure, light intensity, and laser beam diameter

Hubert van den Bergh

1990